Evaluation of bovine embryo quality based on gene expression profiling using whole-transcriptome amplification

Area of Science:

• Reproductive Biology
• Developmental Biology
• Genomics

Background:

• Assessing the quality of bovine embryos produced through in vitro fertilization (IVF) is essential for improving assisted reproductive technologies.
• Gene expression patterns are critical indicators of embryonic development and viability.

Purpose of the Study:

• To develop a gene expression profiling method for evaluating bovine IVF embryo quality.
• To compare gene expression patterns between in vivo-derived (IVD) and IVF bovine embryos.

Main Methods:

• Whole-transcriptome amplification was used to analyze the expression of 11 key developmental genes in individual bovine embryos.
• Gene expression levels (low, medium, high) were classified for each gene in both IVD and IVF embryos.
• Correlation analysis was performed on gene expression relationships within individual embryos.

Main Results:

• In vitro fertilized (IVF) embryos showed a significantly higher proportion of low expression for SOX2, NANOG, and FGF4 genes compared to in vivo-derived (IVD) embryos (P < 0.01).
• The correlation patterns between gene expression levels differed between IVD and IVF embryos.
• Gene expression profiling revealed distinct molecular signatures between developmental stages.

Conclusions:

• Gene expression profiling of developmentally important genes can serve as a valuable indicator for assessing bovine IVF embryo quality.
• Using in vivo-derived (IVD) embryos as a reference provides a benchmark for evaluating IVF embryo development.
• This approach aids in identifying suboptimal IVF embryos and improving reproductive efficiency.